﻿////////////////////////////////////////////////////////////////////////////////////
//  CameraFilterPack v2.0 - by VETASOFT 2015 //////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////

Shader "CameraFilterPack/FX_8bits" {
	Properties 
	{
		_MainTex ("Base (RGB)", 2D) = "white" {}
		_TimeX ("Time", Range(0.0, 1.0)) = 1.0
		_Distortion ("_Distortion", Range(1.0, 10.0)) = 1.0
	}
	SubShader 
	{
		Pass
		{
			ZTest Always
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#pragma fragmentoption ARB_precision_hint_fastest
			#pragma target 3.0
			#include "UnityCG.cginc"
			
			uniform sampler2D _MainTex;
			uniform float _TimeX;
			uniform float _Distortion;
		       struct appdata_t
            {
                float4 vertex   : POSITION;
                float4 color    : COLOR;
                float2 texcoord : TEXCOORD0;
            };
 
            struct v2f
            {
                  half2 texcoord  : TEXCOORD0;
               float4 vertex   : SV_POSITION;
                fixed4 color    : COLOR;
           };
            
  			v2f vert(appdata_t IN)
            {
                v2f OUT;
                OUT.vertex = mul(UNITY_MATRIX_MVP, IN.vertex);
                OUT.texcoord = IN.texcoord;
                OUT.color = IN.color;
                
                return OUT;
            }
          
float hash(float2 p) 
{ 
return frac(1e4 * sin(17.0 * p.x + p.y * 0.1) * (0.1 + abs(sin(p.y * 13.0 + p.x)))); 
}


float compare(float3 a, float3 b) {
	a*=a*a;
	b*=b*b;
	float3 diff = (a - b);
	return dot(diff, diff);
}

inline float mod(float x,float modu) 
{
  return x - floor(x * (1.0 / modu)) * modu;
}

float4 frag (v2f i) : COLOR
{
float2 q  = i.texcoord;
 
float2 c = q ;
float2 coord = c ;
	
float3 src = tex2D(_MainTex, coord).rgb;
	
float3 dst0 = 0;
float3 dst1 = 0;
float best0 = 1e3;
float best1 = 1e3;

src = src+_Distortion;

#define TCOLOR(R, G, B) { const float3 tst = float3(R, G, B); float err = compare(src, tst); if (err < best0) { best1 = best0; dst1 = dst0; best0 = err; dst0 = tst; } }

TCOLOR(0.,0.,0.);
TCOLOR(0.62890625,0.30078125,0.26171875);
TCOLOR(0.4140625,0.75390625,0.78125);
TCOLOR(0.6328125,0.33984375,0.64453125);
TCOLOR(0.359375,0.67578125,0.37109375);
TCOLOR(0.30859375,0.265625,0.609375);
TCOLOR(0.79296875,0.8359375,0.53515625);
TCOLOR(0.63671875,0.40625,0.2265625);
TCOLOR(0.4296875,0.32421875,0.04296875);
TCOLOR(0.796875,0.49609375,0.4609375);
TCOLOR(0.38671875,0.38671875,0.38671875);
TCOLOR(0.54296875,0.54296875,0.54296875);
TCOLOR(0.60546875,0.88671875,0.61328125);
TCOLOR(0.5390625,0.49609375,0.80078125);
TCOLOR(0.68359375,0.68359375,0.68359375);
TCOLOR(1.,1.,1.);
#undef TRY	

	float4 FragColor = float4(mod(q.x + q.y, 2.0) > (hash(q * 0.5 ) * 0.75) + (best1 / (best0 + best1)) ? dst1 : dst0, 1.0);
	return FragColor;
			
	}
			
			ENDCG
		}
		
	}
}